From 13fc3db40e66fba5d2a24e2c4e5b959d9f5fabce Mon Sep 17 00:00:00 2001
From: David Elliott <dfe@tgwbd.org>
Date: Mon, 7 Apr 2003 04:04:10 +0000
Subject: [PATCH] Do some sanity checks in DoDrawText to make sure we actually
 have some glyphs

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@20055 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/cocoa/dc.mm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/cocoa/dc.mm b/src/cocoa/dc.mm
index b6c71aaca8..7b54beb590 100644
--- a/src/cocoa/dc.mm
+++ b/src/cocoa/dc.mm
@@ -107,7 +107,11 @@ void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
 
     NSRange glyphRange = [sm_cocoaNSLayoutManager glyphRangeForTextContainer:sm_cocoaNSTextContainer];
     NSRect usedRect = [sm_cocoaNSLayoutManager usedRectForTextContainer:sm_cocoaNSTextContainer];
-
+    // NOTE: We'll crash trying to get the location of glyphAtIndex:0 if
+    // there is no length or we don't start at zero
+    if(!glyphRange.length)
+        return;
+    wxASSERT_MSG(glyphRange.location==0,"glyphRange must begin at zero");
 
     NSAffineTransform *transform = [NSAffineTransform transform];
     [transform translateXBy:x yBy:y];
-- 
2.45.2